Set the maximum amount of Mana a Player can have:
setMaxMana(Player player, int amount)

Set the current amount of Mana from a Player:
setCurrentMana(Player player, int amount)

Get the maximum amount of Mana a Player can have (returns int):
getMaxMana(Player player)

Get the current amount of Mana from a Player (returns int):
getCurrentMana(Player player)

Recover the Mana from a Player (recovers every minute):
recoverMana(Player player, float recoveryPercent)